Mitutoyo Digital Scale Serial Interfacing with Wiznet 5500EVB Pico using Arduino IDE

[themadgreek]

Hi

I am currently using a Mitutoyo digital scale via serial interface thru an Arduino UNO to read distance measurements, Thanks to sspence from
[Sspence's Projects - Instructables]
(https://www.instructables.com/member/sspence/instructables/)

I am hoping to have this setup with the Wiznet 5500 EVB Pico instead of the UNO using Arduino IDE. I got the code I had for the uno to be compiled and uploaded to the Pico, but it doesn't seem to work at all. Hoping you would have some insights on this matter.
thanks!!

This is the code I have from sspence's page.

`int req = 5; //mic REQ line goes to pin 5 through q1 (Arduino high pulls request line low)
int dat = 2; //mic Data line goes to pin 2
int clk = 3; //mic Clock line goes to pin 3
int i = 0;
int j = 0;
int k = 0;
int signCh = 8;
int sign = 0;
int decimal;
float dpp;
int units;

byte mydata[14];
String value_str;
long value_int; //was an int, could not measure over 32mm
float value;

void setup() {

Serial.begin(9600);

pinMode(req, OUTPUT);

pinMode(clk, INPUT_PULLUP);

pinMode(dat, INPUT_PULLUP);

digitalWrite(req,LOW); // set request at high

}

void loop() {

digitalWrite(req, HIGH); // generate set request
for( i = 0; i < 13; i++ ) {
k = 0;
for (j = 0; j < 4; j++) {
while( digitalRead(clk) == LOW) {
} // hold until clock is high
while( digitalRead(clk) == HIGH) {
} // hold until clock is low
bitWrite(k, j, (digitalRead(dat) & 0x1));
}

mydata[i] = k;

}
sign = mydata[4];
value_str = String(mydata[5]) + String(mydata[6]) + String(mydata[7]) + String(mydata[8] + String(mydata[9] + String(mydata[10]))) ;
decimal = mydata[11];
units = mydata[12];

value_int = value_str.toInt();
if (decimal == 0) dpp = 1.0;
if (decimal == 1) dpp = 10.0;
if (decimal == 2) dpp = 100.0;
if (decimal == 3) dpp = 1000.0;
if (decimal == 4) dpp = 10000.0;
if (decimal == 5) dpp = 100000.0;

value = value_int / dpp;

if (sign == 0) {
Serial.println(value,decimal);
}
if (sign == 8) {
Serial.print("-"); Serial.println(value,decimal);
}

digitalWrite(req,LOW);
delay(100);
}`

[maxgerhardt]

Please format the cpp code correctly, see here

but it doesn't seem to work at all.

Not enough info, what's the serial output, what exactly doesn't seem to work? No output at all, wrong output?

Onto which pins did you connect the circuit? Whe you use

int req = 5; //mic REQ line goes to pin 5 through q1 (Arduino high pulls request line low)
int dat = 2; //mic Data line goes to pin 2
int clk = 3; //mic Clock line goes to pin 3

It's expected to be connected to GP5, GP2, GP3.

[themadgreek]

Thanks @maxgerhardt

I had it connected to the wrong pins. I am very new with Picos and the pin # and GP# kinda got me confused. Your answer was right on the money!!

[themadgreek]

Hi @maxgerhardt

Im still a basic beginner with the Pico. How can I send the data acquired via ethernet? I want the data accessed remotely from a computer through the network.

[maxgerhardt]

Why would that need changing? The hardware connects to your digital scale are separate from the on-board data connection to the Ethernet chip (aka SPI to the W5500). These are two separate circuits.

[themadgreek]

I understand the two circuits are different, But where i am confused is with the code. Do i just insert Ethernet.init(17); and the Ip address to the code?

[maxgerhardt]

You should first try a sketch that only uses Ethernet and ignores your other circuit. You'll figure out how to merge / integrate your old sketch with the Ethernet code later. As I said, try https://github.com/arduino-libraries/Ethernet/blob/master/examples/WebClient/WebClient.ino first with a Ethernet.init(17); and possibly a pinMode(20, OUTPUT); digitalWrite(20, HIGH); to release the reset line.

[themadgreek]

ok perfect, that makes sense Sorry I'm new to this and coding is not my forte. Figuring this out this interesting area slowly

[themadgreek]

Hi @maxgerhardt
I tried the web client example, but it is not working on the system that i was trying. And i tried the chat server example and that seem to work fine. Do you think i can use the chat server code to modify the digital scale code to have the functionality i was hoping for?

[themadgreek]

Hi @maxgerhardt
I figured out how to send the distance data off the digital scale via ethernet. This is the code I ended up figuring out. The one thing I've noticed, and I haven't sorted out yet is that to receive the data via ethernet the connection has to see some kinda handshake or message. So, in my case the serial monitor would bring up distance data right away without doing anything, but data via ethernet only comes in when I send a character or string to it, and then the data just keeps coming in just the way it's supposed to. I realize it's something in my code that does this, but I couldn't find out what is doing this yet. But the code works to an extent.

`#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0x90, 0xA2, 0xDA, 0x0D, 0xA3, 0x12 };
IPAddress ip(10,10,10,112);
byte subnet[] = { 255, 255, 255, 0 };

EthernetServer server(23);

int req = 5; //mic REQ line goes to pin 5 through q1 (Arduino high pulls request line low)
int dat = 2; //mic Data line goes to pin 2
int clk = 3; //mic Clock line goes to pin 3
int i = 0;
int j = 0;
int k = 0;
int signCh = 8;
int sign = 0;
int decimal;
float dpp;
int units;

byte mydata[14];
String value_str;
long value_int; //was an int, could not measure over 32mm
float value;

void setup() {

Ethernet.init(17); // WIZnet W5100S-EVB-Pico W5500-EVB-Pico

Serial.begin(9600);

pinMode(req, OUTPUT);

pinMode(clk, INPUT_PULLUP);

pinMode(dat, INPUT_PULLUP);

pinMode(20, OUTPUT);

digitalWrite(20, HIGH); //change

digitalWrite(req,LOW); // set request at high

Ethernet.begin(mac, ip, subnet);

server.begin();

delay (100);
}

void loop() {

EthernetClient client = server.available();

digitalWrite(req, HIGH); // generate set request

for( i = 0; i < 13; i++ ) {
k = 0;
for (j = 0; j < 4; j++) {
while( digitalRead(clk) == LOW) {
} // hold until clock is high
while( digitalRead(clk) == HIGH) {
} // hold until clock is low
bitWrite(k, j, (digitalRead(dat) & 0x1));
}

mydata[i] = k;

}
sign = mydata[4];
value_str = String(mydata[5]) + String(mydata[6]) + String(mydata[7]) + String(mydata[8] + String(mydata[9] + String(mydata[10]))) ;
decimal = mydata[11];
units = mydata[12];

value_int = value_str.toInt();
if (decimal == 0) dpp = 1.0;
if (decimal == 1) dpp = 10.0;
if (decimal == 2) dpp = 100.0;
if (decimal == 3) dpp = 1000.0;
if (decimal == 4) dpp = 10000.0;
if (decimal == 5) dpp = 100000.0;

value = value_int / dpp;

if (sign == 0) {
Serial.println(value,decimal);
client.println(value,decimal);
}
if (sign == 8) {
Serial.print("-");
client.print(", ");
Serial.println(value,decimal);
client.println(value,decimal);

}

digitalWrite(req,LOW);
delay(100);

//EthernetClient client = server.available();
// if (client) {
// while (client.connected()) {
// client.println(value,decimal);
// client.print(", ");
// client.println(value,decimal);

// }
//client.stop();
//}

}`

[themadgreek]

I tried it, now it brings the first data and stops, without having to send a character, no other data coming in thereafter, while serial monitor brings in all the stream of data always.

[maxgerhardt]

Updated code, correctly formatted please?

[themadgreek]

Didnt change much, just changed server.available(); to server.accept();
And i ran into the issue you warned about.

`#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0x90, 0xA2, 0xDA, 0x0D, 0xA3, 0x12 };
IPAddress ip(10,10,10,112);
byte subnet[] = { 255, 255, 255, 0 };

EthernetServer server(23);

int req = 5; //mic REQ line goes to pin 5 through q1 (Arduino high pulls request line low)
int dat = 2; //mic Data line goes to pin 2
int clk = 3; //mic Clock line goes to pin 3
int i = 0;
int j = 0;
int k = 0;
int signCh = 8;
int sign = 0;
int decimal;
float dpp;
int units;

byte mydata[14];
String value_str;
long value_int; //was an int, could not measure over 32mm
float value;

void setup() {

Ethernet.init(17); // WIZnet W5100S-EVB-Pico W5500-EVB-Pico

Serial.begin(9600);

pinMode(req, OUTPUT);

pinMode(clk, INPUT_PULLUP);

pinMode(dat, INPUT_PULLUP);

pinMode(20, OUTPUT);

digitalWrite(20, HIGH); //change

digitalWrite(req,LOW); // set request at high

Ethernet.begin(mac, ip, subnet);

server.begin();

delay (100);
}

void loop() {

EthernetClient client = server.available();

digitalWrite(req, HIGH); // generate set request

for( i = 0; i < 13; i++ ) {
k = 0;
for (j = 0; j < 4; j++) {
while( digitalRead(clk) == LOW) {
} // hold until clock is high
while( digitalRead(clk) == HIGH) {
} // hold until clock is low
bitWrite(k, j, (digitalRead(dat) & 0x1));
}

mydata[i] = k;

}
sign = mydata[4];
value_str = String(mydata[5]) + String(mydata[6]) + String(mydata[7]) + String(mydata[8] + String(mydata[9] + String(mydata[10]))) ;
decimal = mydata[11];
units = mydata[12];

value_int = value_str.toInt();
if (decimal == 0) dpp = 1.0;
if (decimal == 1) dpp = 10.0;
if (decimal == 2) dpp = 100.0;
if (decimal == 3) dpp = 1000.0;
if (decimal == 4) dpp = 10000.0;
if (decimal == 5) dpp = 100000.0;

value = value_int / dpp;

if (sign == 0) {
Serial.println(value,decimal);
client.println(value,decimal);
}
if (sign == 8) {
Serial.print("-");
client.print(", ");
Serial.println(value,decimal);
client.println(value,decimal);

}

digitalWrite(req,LOW);
delay(100);

//EthernetClient client = server.accept();
// if (client) {
// while (client.connected()) {
// client.println(value,decimal);
// client.print(", ");
// client.println(value,decimal);

// }
//client.stop();
//}

}`

[maxgerhardt]

You are not managing the connected clients like in the example I linked you to, so this only works for one loop() iteration. Explicitly, you are missing the saving the accepted clients into an array, clearing them when disconnected, and iterating through all connected clients when you want to send data.

Check out https://gist.github.com/maxgerhardt/a33206a8e76ee6c0b66d574c4a1ad1e8. Untested of course.

[themadgreek]

Hi @maxgerhardt

I tried the sketch you put together, and i works perfectly just how i wanted it to. Thanks a lot for helping, Now i can utilize the sketch as reference for any future builds. I really appreciate your help and your guidance!!

[SSpence]

Remove me from this email group immediately. I did not ask to subscribe to this.

On Fri, Feb 17, 2023 at 5:15 PM Maximilian Gerhardt < ***@***.***> wrote: You are not managing the connected clients like in the example I linked you to, so this only works for one loop() iteration. Explicitly, you are missing the saving the accepted clients into an array, clearing them when disconnected, and iterating through all connected clients when you want to send data. Check out https://gist.github.com/maxgerhardt/a33206a8e76ee6c0b66d574c4a1ad1e8. Untested of course. — Reply to this email directly, view it on GitHub <#1169 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AFIPHXMDA4BBKMYXCZXK7ELWX72AFANCNFSM6AAAAAAUYGPCQI> . You are receiving this because you were mentioned.Message ID: ***@***.*** .com>

-- Shala Spence, M.Ed. NEAAAT Instructional Coach 2018-19 NEAAAT Teacher of the Year FIRST Robotics Competition Team Lead Coach #teamNEAAAT

…

-- *E-mail correspondence to and from this address is subject to North Carolina's Public Records Act,  N.C. Gen. Stat. Sec. 132, and may be disclosed to third parties.  However, Federal and State law protects personal health and other information that may be contained in this e-mail from unauthorized disclosure.  If you are not the intended recipient, please delete this e-mail and any accompanying documents and contact the sender immediately.  Unauthorized disclosure, copying or distribution of any confidential or privileged content of this e-mail is prohibited.*

[maxgerhardt]

Idk how you got into this thread, since I didn't even quote your username or something, but just use the unsubscribe link that Github gave you

or unsubscribe
https://github.com/notifications/unsubscribe-auth/AFIPHXMDA4BBKMYXCZXK7ELWX72AFANCNFSM6AAAAAAUYGPCQI

[SSpence]

I do not have a GitHub account.

On Fri, Feb 17, 2023 at 5:19 PM Maximilian Gerhardt < ***@***.***> wrote: Idk how you got into this thread, since I didn't even quote your username or something, but just use the unsubscribe link that Github gave you or unsubscribe https://github.com/notifications/unsubscribe-auth/AFIPHXMDA4BBKMYXCZXK7ELWX72AFANCNFSM6AAAAAAUYGPCQI — Reply to this email directly, view it on GitHub <#1169 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AFIPHXLVAZRQXVLVH3JSFKDWX72P5ANCNFSM6AAAAAAUYGPCQI> . You are receiving this because you were mentioned.Message ID: ***@***.*** .com>

-- Shala Spence, M.Ed. NEAAAT Instructional Coach 2018-19 NEAAAT Teacher of the Year FIRST Robotics Competition Team Lead Coach #teamNEAAAT

…

-- *E-mail correspondence to and from this address is subject to North Carolina's Public Records Act,  N.C. Gen. Stat. Sec. 132, and may be disclosed to third parties.  However, Federal and State law protects personal health and other information that may be contained in this e-mail from unauthorized disclosure.  If you are not the intended recipient, please delete this e-mail and any accompanying documents and contact the sender immediately.  Unauthorized disclosure, copying or distribution of any confidential or privileged content of this e-mail is prohibited.*

[maxgerhardt]

Okay so https://github.com/SSpence/FRC7715 is not a repository of yours.. under your username?

Well in any case, looks like github is glitching, if it keeps happening contact support. I don't have the power to unsubscribe you.